加--ed
prefer- preferred
whip-whipped
beg-begged
drip-dripped
dot-dotted
drop-dropped
fit-fitted
hug-hugged
plan-planned
pat-patted
rid-ridded
rob-robbed
rebet-rebetted
regret-regretted
stop-stopped
stir-stirred
rub-rubbed
travel-travel(l)ed
动词过去规则变化，以重读闭音节结尾且只有一个辅音字母，先双写辅音字母再加ed
如
stop-stopped 停止
clap -clapped
drop-dropped
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